Rational regulation of tungsten oxides with specific exposed facets for the investigation of morphology-dependent hydrogen gasochromic performance

• Published in: International journal of hydrogen energy 2024-03, Vol.60, p.20-27
• Main Authors: Liu, Dandan, Geng, Ziheng, Han, Aiyan, Yu, Ping, Zhang, Kaikai, Liu, Huan, Liu, Yunqi
• Format: Article
• Language: English
• Subjects: Gasochromic; Growth orientation; Hydrogen detection; Morphology; Tungsten oxide
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2024.02.108

In this paper, WO3 with specific exposed facets was prepared through hydrothermal method, then Pt nanoparticles were decorated on the surface of WO3 to enhance the H2 dissociation ability, and the obtained Pt/WO3 materials could realize the visualized H2 detection by the rapid color change of powder. In specific, the high exposure of oxygen ion at c-axis and the shortened diameter of (001) crystal facets is helpful for achieving fast coloring-blenching process. As a result, WO3 nanowires could exhibit a reflectance change of 86.2%, rapid coloring time (64 s) and recovery rate compared with nanorods and microspheres. Moreover, the detailed influencing mechanism of morphology on diffusion and injection of H and O atoms during gasochromism was revealed. This study could contribute to deepen the understanding of morphology-dependent hydrogen gasochromic performance from microscopic view. •Pt decorated WO3 hydrogen gasochromic materials with different morphologies were prepared.•The morphology discrepancy of WO3 resulted in differentiated gasochromic performance.•Enhancing the exposure of O2− at c axis could improve gasochormic performance of WO3.•The mechanism of morphology-dependent hydrogen gasochromic performance was explored.